Highly efficient and compact cavity oscillator for high-power, optically pumped gas terahertz laser

被引：10
|
作者：
Geng, L. J. [1 ]
Qu, Y. C. [1 ]
Zhao, W. J. [1 ]
Du, J. [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Tunable Laser, Harbin 150080, Peoples R China
来源：
OPTICS LETTERS | 2013年 / 38卷 / 22期
关键词：
QUANTUM CASCADE LASER; D2O LASER; DIGITAL HOLOGRAPHY; GENERATION; PULSES;
D O I：
10.1364/OL.38.004793
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate a highly efficient and compact terahertz cavity oscillator that is based on z-cut crystal quartz used as the dichroic beam splitter, for the first time to the best of our knowledge. With D2O gas as the active medium, pumped with a multitransverse mode TEACO(2) laser, experimental verification was also presented to demonstrate the advantages of this cavity oscillator. With the cavity length of 120 cm, 7.4 mJ pulse energy at pulse repetition frequency of 6 Hz, pulse width of 90 ns, and peak power of 82.2 kW were achieved at a wavelength of 385 mu m. Photon conversion efficiency (PCE) of 44% was obtained at the maximum output level from this terahertz cavity oscillator. Furthermore, to our knowledge, this PCE is the highest efficiency ever reported in D2O gas, 385 mu m terahertz cavity laser systems. The beam quality or M-2 factor was found to be about 1.77. (C) 2013 Optical Society of America
引用
收藏
页码：4793 / 4796
页数：4
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